make it py2 and py3 compatible

examples/spark-recordcount.py

@@ -37,7 +37,10 @@
 from pyspark import SparkConf, SparkContext
 from _pybgpstream import BGPStream, BGPRecord
 import sys
-import urllib.request, urllib.error, urllib.parse
+try:
+    import urllib.request as urllib_request
+except:
+    import urllib2 as urllib_request
 
 # Output one data point per day
 RESULT_GRANULARITY = 3600*24
@@ -56,7 +59,7 @@
 
 # Query the BGPStream broker and identify the collectors that are available
 def get_collectors():
-    response = urllib.request.urlopen(COLLECTORS_URL)
+    response = urllib_request.urlopen(COLLECTORS_URL)
     data = json.load(response)
     results = []
     for coll in data['data']['collectors']: